Embeded linux 之 mtd nand

應(yīng)用層：(使用mtd ioctl)

0.獲取mtd基本信息

struct mtd_info_user {
unsigned char type;　　//flash類(lèi)型
unsigned int flags;　　 ?
unsigned int size;?　　 ?//分區(qū)大小
unsigned int erasesize; //塊大小
unsigned int writesize; ?//頁(yè)數(shù)據(jù)大小
unsigned int oobsize; ? ?//OOB大小
unsigned int ecctype; ? //ECC類(lèi)型
unsigned int eccsize; ? ?//ECC大小
};

fd = open("/dev/mtd", O_RDWR);

ioctl(fd, MEMGETINFO, &mtd_info);

1.讀頁(yè)數(shù)據(jù)

2.寫(xiě)頁(yè)數(shù)據(jù)

unsigned char pagedate[2048] = {...};

write(fd, pagedate, mtd_info.writesize);

3.讀OOB

struct mtd_oob_buf {
unsigned int start;
unsigned int length;
unsigned char *ptr;
};

unsigned char oobbuf2[64];

OOB_INFO.start = page_num * (2048);
OOB_INFO.ptr = oobbuf2;
ioctl(fd, MEMREADOOB, &OOB_INFO);

4.寫(xiě)OOB

unsigned char oobbuf[64] = {...};

OOB_INFO.start =?page_num * (2048);
OOB_INFO.ptr = oobbuf;
ioctl(fd, MEMWRITEOOB, &OOB_INFO);

?mtd demo

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